If an extra electron is pushed into the atom so that it has an excessive number of electrons then it would form a negative ion.
The right side of the Periodic Table, or the side with no metals, is where non-metals are located.
Atoms generally experience atomic radius contraction as a result of adding electrons to the same valence shell and protons to the nucleus, with the smallest atoms to the right of the Periodic Table
As a result, the elements on the right side of the Periodic Table, such as fluorine, chlorine, and oxygen, Tend to be oxidizing, which means that their unshielded nuclear charge causes them to accept electron density.
N³⁻,O²⁻,F⁻ and Cl⁻
Clearly, the Parent atoms (or molecules) are unquestionably oxidizing species.
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